The MAIZE expert system for field corn management contains modules on pre-season and production season insect, disease, and weed control as well as hybrid selection. The pre-season planning section allows the grower to anticipate potential pest problems before planting and helps to develop a pest management plan for each field. The purpose of the production season section is to provide recommendations regarding control of insects, diseases, and weeds affecting field corn. The production season section is divided into three primary sections, management, diagnosis, and agronomic considerations.